Adam is 36 years old.
Bryan is 6 years old.
In a few years' time, Adam will be 3 times as old as Bryan.
- In how many years' time will Adam be 3 times as old as Bryan?
- How old will Adam be by that time?
|
Adam |
Bryan |
Difference |
Before |
36 |
6 |
30 |
Change |
+ ? |
+ ? |
|
After |
3 u |
1 u |
2 u |
(a)
For Adam to be 3 times as old as Bryan,
Bryan's age = 1 u
Adam's age = 3 u
Difference in their age
= 3 u - 1 u
= 2 u
Age difference between Adam and Bryan
= 36 - 6
= 30
2 u = 30
1 u = 30 ÷ 2 = 15
Number of years' time when Adam will be 3 times as old as Bryan
= 15 - 6
= 9
(b)
Adam's age in 9 years' time
= 3 u
= 3 x 15
= 45
Answer(s): (a) 9; (b) 45